Change-speed gearing



April 15, 1'930. R. sAGLloNI CHANGE SPEED GEARING F'iled April 11, 1927 2 SheetS--Shee'Y l gwvmtoc April l5, 1930. R SAGLIONI" I I v 1,754,697

CHANGE SPEED GEARING Filed April l1, 1927 2 Sheets--SheeiI 2 gwuentoz omo Jaglo n Patented pr. 15, 1930 UNITED STATES PATENT "or-Fica nonno sAGLIoNI, or CALTAGIRONE, ITALY CHANGE-SPEED GEARING Application led .April 11, 1927, Serial No.' 132,816,- and in Italy April 14, 1926.

This invention relates to gearing for driving one shaft from another, and is suitable for use on motor cars, tramcars, lifts and other machines Where a variation-f the speed of the driven shaft or shafts in relation to the driving shaft is desired. The invention. also embodies means for reversing the rotation oi the driven shaft or shafts.

Briefly, the invention consists in providing on the driving shaft a helical thread or screw, the pitch of which varies, and in using in conjunction with the same a toothed wheel or Wheels on the driven shaft or shafts, the

said teeth being pressed outwardly by springs.

The screw is slidable on its shaft and may be shifted in one direction' by a coil spring against which it is moved by any suitable lever or other device, or it may be acted upon from both sides by such lsprings and be shifted by a lever or the like. A

The employment of this gearing'dispenses with the usual change-speed gear mechanism, and the driven wheels may-take the place ofthe usual differential gear.

A The invention will be described as applied to motor cars or tram cars; but it will be apparent that it can likewise be applied to cranes and othea. machines and mechanisms Where a variation in the speed of the driven shaft or member/is desired and for adjustment according to the load and, in the case of a motor car or tram car, the gradient.

In the accompanying drawings:

-Figure lfs a part-sectional side elevation y of a form of gearing suitable for use on motor cars;

Fig. 2 is a central cross-section thereof;

Fig. 3 is a part-sectional end view ofa modification; and

Fig. 4 is a side view ,of Fig. 3.

The drawings are in part diagrammatic and omit the control mechanism, which may be of any suitable kind, and by which the screw can be moved along its shaft.

-Referring to Figs. 1 an 2. the screw sleeve 1 is slidable on shaft 2 and Adrives two wheels i 3, 3 ri idly secured to. shafts 4, 4 and mounted upon all bearings. These wheels 3, 3 are. provided with teeth 5 that are p radially outward by springs`6, and they are si multaneously but independently driven by the screw 1 and may rotate at different speeds, thus providing the diierential movement required for the driving wheels of a motor car. v I

The screw 1 is shown in nearly its intermediate position and'is pressed towards the left by the spring 7 the strength of which may be adjusted by turning the screw cap 8.

The shaft 2, with the screw 1 thereon, is movable against the pressure of spring 7 by means of a lever or equivalent acting on the prolongation of the said shaft. The pitch of the screw from points 9 to 10 varies and is steeper than that from points 10 to 12, and from points 12 to13 it is reversed, so that two ratios of speed are obtained, one by the parts 9-10 and the other by the part 10-12, while reverse is effected by the part 12-13, with a neutral position at 12.

The portion 9-10, which is designed to ciect forward motion, has its grooves directed toward the right, and those of the portion 10--12- are also directed, toward the right; -while the portion 12-13 for effecting rearward motion has its grooves directed toward the left'.

The wheels 3, 3 have been shown as iixed directly to the wheel axles 4, 4 but they may b e cmnected thereto by lreducing gear if desire -It will be observed that the teeth 5 have rounded outer ends, so that when the engine is running and the screw stands with the neu- 85 tral portion 12 opposite the part or line 14, the said teeth in engagement with `the sc rew are simply pushed back against their springs and no movement of the car takes place;

immediately the screw is moved lengthwise,

it drives the wheels and the car commences to travel.

If the power of the engine is reduced while the car is traveling, the car can drive the wheels 3, 3 and thus set up or produce a brak- 05 ing eect which can be advantageously when a reduced is required.

It will be seesrelom the above thatl the mechanism is very simple and easily manipulated, and that for motor cycles only one l wheel, much the same as wheel 3, will be needed In Figs. 3 and 4, the same reference num` .bers are used as those in Figs. 1 and 2 for substantially like parts; but in this construction the wheels 3, 3 are held to the shaft 4 by friction members 15, 15. The shaft may any suitable number of wheels such as 3.

ith this gear' the engine can be allowed to turn at its normal speed or at any redetermined speed, and the rate of trave of the vehicle, whether motor car, mo-

t'or lcycle or tram car, can be regulated in accordance with traffic requirements and road inclinations.

The gearing can be used as a brake by simply switching olf the ignition current; and instead of using a spring or springs, the screw may be shifted by any other suitable means.

I claim as my invention:

1. Change-speed gearing, comprising a driving shaft, a sleeve shiftable axially thereon either direction aid formed with a si eoneiece screwo va itc,a drli'en shag, a wheel securedrytbnhd) driven shaft and providedwith a set of teeth for engagement with said screw, and a spring constantly acting on one end of the screw sleeveilzlo force one dlrec tion.

2. ange-s caring, comprisin a driving shaft, a sleev shiftable axially threon in either direction and formed with a single screw, .a driven shaft, a wheel secured to t e driven shaft and provided with a set of teeth for engagement with the screw; said screw embodying a plurality of distinct, in-

tegra1ly-connected portions for effecting forward rotation of the wheel at different' speeds, each such portion having a gradually varying pitch; and a sprin constantly acting on one end of the screw eeve to force it in one direction.

3. Change speed gearing according to claim 2, in which the screw embodies an additional distinct rtlon for eecting reverse rotation of the w eel.

In testimony whereof I aix my s' k'n.tu'le.

ROMEO SAGL ONI. 

